its first use. These intermediate results can be stored and // then used to initialize H each time that a message needs to be // authenticated using the same key. [...] These stored intermediate values // shall be treated and protected in the same manner as secret keys." marshalableInner, innerOK := h.inner.(marshalable) if !innerOK { return } marshalableOuter, outerOK := h.outer.(marshalable) if !outerOK { return } imarshal, err := marshalableInner.MarshalBinary() if err != nil { return } h.outer.Reset()...